My understanding is that the Umstead has 2 L1 chargers available for the general public, including SAS employees and guests. I believe they got them as part of a grant, so the general public can use them. There are no L2 stations there. From what I have been told, they should allow anyone to use them, not just registered hotel guests.
There are a couple on SAS Campus proper, but those are restricted to employees and visitors (you could meet your friend for lunch and charge while eating with him/her).
There is a new L2 charger at the McDonalds on Kildaire Farm Road, near Cary Parkway. It had just a L1 unit for the longest time (and the spot was never available when I drove by). Now it has a single L2 unit, with a well-marked space, and it has been free the last two Tuesdays (12/13, 12/20) when I have done some opportunity charging. The McDonald's chargers are on the Chargepoint network, but are free. I went ahead and paid for the $4.95 keyfob that let's me release the plug and connect my vehicle. Seems to work well.
I love my LEAF!
Delivered: Nov 8, 2011
Lost first bar: 10/2/2014 at 28,410 miles